Can someone list the observable changes that indicate a physical change has occurred? Same for chemical change?

Q#1.) According to newton second law of motion, if we have a rigid body of uncharged mass is observed acceleration, what must be happening? A. a force was once applied but is now not being applied. B. a force is being applied to the mass. C.

How long does it take for only one eighth of a sample of radon-222 to remain

If you could have one wish what would it be?

Will a precipitate form if you mix barium chloride and potassium carbonate?

The most important factor determining chemical properties for an element is?

Balance the following reaction. Leave the box empty if no other coefficient is needed. C2H5 + O2 → CO2 + H2O

What three human body systems coordinate cause an arm to move

Which statement does NOT apply to Alkenes? They readily react They have double bonds They are more stable than alkanes They are unsaturated

Why do scientists say that this technology will not harm fish in the area?

What is the primary cause of global wind patterns on earth?